 scale(0.75)'%3E%3Crect x='6' y='14' width='52' height='36' rx='4' fill='%23e9dcbc' stroke='%2322262b' stroke-width='3'/%3E%3Cpath d='M8 17l24 18 24-18' fill='none' stroke='%2322262b' stroke-width='3' stroke-linejoin='round'/%3E%3Ccircle cx='46' cy='40' r='9' fill='none' stroke='%239c2f22' stroke-width='2.5'/%3E%3Cpath d='M40 40h12' stroke='%239c2f22' stroke-width='2'/%3E%3C/g%3E%3Ctext x='58' y='33' font-family='Rockwell, Georgia, serif' font-weight='700' font-size='24' fill='%2322262b'%3EIRS Letters and Forms%3C/text%3E%3C/svg%3E)
Notice code 09
Notice code 09 — Interest - Interest is figured on unpaid tax from the due date of the return to the date of full pay…
What this IRS notice code means, and what to check before you reply.
What to do next
Start with these steps before you reply.
09
Read the notice carefully and note any deadline. Gather returns, notices, and payment records. Book a free strategy session before responding if the amount is large, unclear, or collection language appears.
What the IRS language says
Interest - Interest is figured on unpaid tax from the due date of the return to the date of full payment or to the date of this notice.
What it usually means
09 is in our IR Manual catalog. Official wording is dense — we translate it for business owners and individuals and map realistic next steps.
Related
Find another letter
Every notice in this library, sorted the way the IRS numbers them.